Aβ肽是伴随阿尔茨海默症发病过程的淀粉样沉积斑的主要成分。Aβ是由其前体蛋白APP被β-和γ-分泌酶依次水解后所产生。Aβ,特别是其聚集形式,对神经细胞具有毒性。体外孵育的Aβ向纤维状形式转变的过程会增加其结合神经元细胞膜蛋白的能力,这其中就包括了APP本身。因此APP除了直接生成Aβ以外,还可能作为细胞表面蛋白来介导Aβ毒性。 在本论文的实验中,我们研究了自发聚集的Aβ1-42对人神经母瘤细胞中Aβ前体蛋白APP的表达水平及代谢过程的影响。我们发现,Aβ1-42寡聚体处理会增加细胞中APP的mRNA和蛋白水平,并且延缓APP的降解过程。同时,Aβ1-42处理会降低细胞表面的APP水平。此外...β-amyloid (Aβ) is the core component of the senile plaques occurring in Alzheimer’s disease. Aβ is derived from β-amyloid precursor protein (APP) through sequential cleavages by β- and γ-secretases. Aβ, especially its aggregated form, is toxic to neuronal cells. Conversion of Aβ to the fibrillar form in vitro markedly increases its binding to specific neuronal membrane proteins, including APP. Thu...学位:理学硕士院系专业:药学院_化学生物学学号:3052009115223